The "R" word has come up a few times on "Mike's On: Francesa on the FAN" recently.

Longtime WFAN host Mike Francesa has speculated that his retirement may come sooner than fans think.

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"We're in different places right now," Francesa said of his relationship with CBS Radio on his Friday show. "We're on different roads and the two may never meet again."

VoteFrancesa: Fan or foe?

Francesa added that he's not 100 percent certain he will last on WFAN through the 2015 NFL season, but he "most likely" will.